Re: Czech style nymphing.. What is your experience?
I do whatever is required and don't know the names for any of the methods. I learned to fly fish myself when I was a kid reading Field and Stream. I found out later the names for all the different casts I figured out.
Anyway, the Czech style of nymphing sounds a lot like "leading" big bunny streamers by King Salmon in the Alaska Rivers. You just keep enough slack out of the line so you can "sense" a strike. Sometimes they nearly rip the rod from your hand, but more often it is a very subtle take that you "sense" more than see or feel.